We present a new flexible 3D ray-tracing code, SoLEnA (Simulation of Light Emission and Amplification) to describe amplification, ASE, and PO in a solid-state amplifier. The code simulates the propagation of pump and witness beams, the pumping of the amplifier material, the polarisation-dependent fluorescence and stimulated emission, arbitrary geometries with multiple materials, and the partial reflection of light at the material interfaces. The polarisation dependence of the material parameters allows high fidelity simulations of realistic Ti:sa solid state amplifiers. We use the code to investigate various geometries of high power, high repetition rate laser amplifiers.
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